To trade by the means of money is the code of men of good will.

21. The utmost good faith shall always be observed towards the Indians; their land and property shall never be taken from them without their consent; and in the property, rights, and liberty, they never shall be invaded or disturbed, unless in just and lawful wars authorized by Congress; but laws founded in justice and humanity shall from time to time be made for preventing wrongs being done to them, and for preserving peace and friendship with them. Northwest Ordinance, Congress of the Articles of Confederation, 13 July 1787